Is your advice about fertilising in February Northern or Southern Hemisphere related?
Certified GKH Gardening Expert
If you are growing an Avocado as a houseplant here is a link with care information.
Since most Avocado that are grown outdoors, the care information in the article below would be for warm climates, zones 8-10
The information in the link below would be for an outdoor Avocado in these growing zones.